Tubular rivet machine



March 7, 1933. I c Y N 1,900,572

TUBULAR RIVET MACHINE Filed 12.

2 Sheets-Sheet l 26 ENVENTOR 7 @haMwELyam.

BY ms ATTORNEY March 7, 1933. c E, LYMAN 1,900,572

TUBULAR RIVET MACHINE 25 Filed seEt. l5. 1 l 2 Sheets-Sheet 2 INVENTOR 7 Charms Elm man.

11 BY HIS ATTORNEY Patented Mar. 7, 1933 UNITED STATES PATENT OFFICE TUBULAR nrvm. mcnnm Application filed September 15, 1931. Serial No. 562,890.

This invention relates to machines for making tubular rivets from solid wire blanks and more particularly to a two-blow machine adapted to form the hollow socket of f: the rivet shank in the first blow and the head of the rivet in the second blow.

The objects of this invention are to provide a two-blow rivet machine of the above nature which will be simple in construction,

10 inexpensive to manufacture, economical of material, time and labor, easy to install and manipulate, and very eflicient and durable in use.

In the drawings:

Fig. 1 represents a longitudinal sectional view of a rivet machine embodying the invention.

Fig. 2 is an elevational face view of the punch bed of the rivet machine.

Fig. 3 is a longitudinal sectional view taken through the punch and die beds which are shown in their normal position, with a rivet blank beingfed into the machine.

Fig. 4 is a similar longitudinal sectional 15 view of the same, showing the parts as they appear in the first,step of the operation,

just after the formation of the tubular shank.

Fig. 5 is a similar longitudinal sectional view of the same, showing the appearance of 39 the machine and rivet blank after the punch bed has receded and has moved upwardly to bring the tubular blank into alinement with the head-extruding punch, and showing the blank about to be forced upon said punch.

Fig. 6 is a similar longitudinal sectional view of the same, in which the punch bed has dropped down to its normal position carrying the rivet blank into alinement with the heading die.

Fig. 7 is a similar longitudinal sectional view of the same, showing the last step of the operation, in which the blank is being headed.

The invention herein disclosed relatesmore especially to a cold process of heading such as was set forth in the prior patent to Campbell, No. 569,406, issued October 13, 1896. It is also to be considered as an improvement over my prior Patent No. 1,588,246, issued June 8, 1926.

Die-bed Referring now to the drawings in which like reference numerals denote corresponding parts throughout the several views, the numeral 10 indicates a portion of the frame of a rivet heading machine to which is attached a stationary die-bed 11 separated from said frame 10, as by a hardened steel block or anvil plate 12. The die-bed 11 is adapted to carry a pair of upper and lower die members, as clearly shown in Fig. 1. The upper die member'comprises a fixed hollow sleeve 13 in which is fitted a hollow reciprocating extruding die 14, normally pressed forwardly by a helical compression spring 15. Intermediate its ends, the die 14 is provided with a flange 16 which is adapted to fit within the interior of the sleeve member '13, and said die 14 also has a reduced rear end 17 upon which the helical spring 15 is centered.

The die 14 has a hollow bore 18 within which is fitted a slidable rivet abutment pin 19 having an integral enlarged head 20 at its rear end, said head being adapted to abut 7 against the forward end of a. knockout plunger 21.

In the process of manufacture of a rivet,

a blank m is first brought into alinement with the hollow bore 18 and is forced thereinto by an extruding punch pin 22, to be hereinafter more fully. described.

The movement of the pin 22 to the left as viewed in Fig.1 causes the abutment pin 19 and the knock-out plunger 21 to recede in 35 the same direction and allows the blank :1: to enter said bore 18, within which said blank is adapted to remain while the punch pin is forming a socket in the shank of said rivet blank 02, (see Fig. 4).

if desired.

The rear ends of both the die sleeve 13 and the swaging die-23 are adapted to abut against the anvll plate 12 and are held securely within the die bed 11 by a pair of vertical set screws 25 and 26. The rear end of the slidin die 14 is also adapted to strike against said, anvil plate 12 when in its rearmost position, as shown in Figs. 4 and 5.

Punch bed Directly in front of the die-bed 11 provision is made for a punch bed 27, which is adapted to be carried upon the forward face of a reciprocating punch slide 28. The bed 27 is secured in position upon said slide 28 by two heavy horizontal bolts 29 and 30, and

separated from said slide 28 by a hardened anvil plate 31.

The punch slide 28 is mounted for vertical reciprocation on the front face of a horizontal gate 32 driven by any suitable mechanism, not shown.

Cooperating with the sliding die 14 is a hollow punch holder 33 secured within the punch bed 27. Within said punch holder 33 is a sliding punch 34 normally pressed forward by a compression spring 35 and held.

in abutment with the rear shoulder of the hollow punch 33 by means of an intermediate annular flange 36.

Within the sliding punch 34 is a sliding sleeve 37 which is employed to support and guide the punch pin 22. The sleeve 37 also serves to provide a smooth edge on the extruded end of the rivet shank, as shown in Fig. 4. The rear face of the punch pin 22 is adapted to engage the forward end of an adjustable set screw 38 which is received in the tapped rear section of the sliding punch 34. The adjustment of the set screw 38 determines the length to which the rivet shank may be extruded.-

In order to hold therivet shank during the headingoperation, provision is made of a hollow header punch 39, located directly below the sliding punch 34. The punch 39 has its rear end abutted against a hardened washer 40 which in turn engages the front face of the anvil plate 31. The washer 40 is provided with a countersunk recess in which is fitted the enlarged head 41 of a center punch 42 rigidly held in the punch 39 and having a slidable stripper sleeve 43 fitted thereabout.

In order to strip the completed rivet ma from the punch 39, the stripper sleeve 43 is provided on its rear end with a pair of spaced annular flanges 44 and 45 adapted to embrace the prongs of a forked stud 46, shown in Figs. 2 and 3. The forked stud 46 is carried by an oscillating lever 47 which has its upper end pivoted to the side wall of the punch bed 27 by means of a pivot stud 48. The lower free end of the oscillating lever 47 is provided with an enlarged tapped boss 49 within which is located a set screw 50 held by a lock nut 51. The lever 47 is normally maintained in its rearmost position by a spring not shown, but is adapted to be swung forwardly into the position shown in Fig. 1 by the engagement of the set screw 50 with a bracket or lug 52 connected to the frame 10 whereby the finished rivet will be ejected from the punch 39 as the punch bed recedes from the die-bed.

Operation In operation, assuming that the die-bed 11 and the punch bed 12 are in their normal positions as shown in Figs. 1 and 3, after a rivet blank whas been cut off from the stock rod, not shown, it will be carried by a suitable mechanism, not shown, into a position directly in alinement with the abutment pin 19 and the extruding pin 22. as shown in Fig. 3. When in this position, the punch bed 27 will be advanced into engagement with the rivet blank a: which in turn will engage the pin 19 and will cause said pin and the knockout plunger 21 to move rearwardly into the frame of the machine until the movement of the plunger 21 is checked by suitable mechanism, not shown. The punch 34-and the extruding pin 22, however, will continue to advance for a short time causing the end of the rivet blank :1: to be extruded and to flow around the extruding pin 22 within the sliding punch 34, thus forming a hollow shank upon the end of the rivet blank, as shown in Fig. 4.

'In order to transfer' the extruded rivet blank :0 from the extruding die 14 to the header punch 39, the punch bed 27 will then be withdrawn to its normal position, shown in Figs. 1 and 3, leaving the extruded blank m partly within the bore 18 of the extruding die 14. The punch bed 27 will then be moved upwardly by means of the vertically reciprocating slide 28, by which it is carried, until the header punch 39 is in alinement with the extruding punch 14, at which time the punch bed will be again advanced to the position shown in Fig. 5.

The knock-out plunger 21 will then be moved forwardly in the direction of the arrow in Fig. 5, stripping the extruded rivet shank w from the extruding die 14 and transferring it into the bore of the header punch 39. The punch bed 27 will then be withdrawn and lowered to its normal position shown in Fig. 1, carrying with it the rivet shank. The punch bed will then be advanced for the third time toward the die-bed 11.

In the meantime, a second rivet blank wl will have been fed into alinement with the extruding punch pin 22 and will at this time be located within the extruding die 14, as shown in Fig. 6. As the third advancin movement of the punch bed 27 is complete the exposed end of the lower rivet shank will be swaged over into the form of a head in the s herical recess 24 of the die 23, as shown in I ig. 7. At the same time, the shank of the second or upper rivet blank will be extruded, as above described.

As the punch bed 27 is withdrawn from the position shown in Fig. 7 to its normal position, shown in Figs. 1 and 3, the set screw 50 carried on the lower end of the oscillating lever 47 will strike against the bracket .52 causing said lever 47 to swing outwardly. The sleeve 43 will thus be caused to stri the finished rivet ma from the header punc 39. The finished rivet ma will then drop downwardly between the punch and die beds, as shown in phantom in Fig. 3, andbe received in a suitable receptacle, not shown. The above-described operations will be repeated as long as the machine is running.

One advantage of this invention is that headed tubular rivets may be quite rapidly produced in a single machine without requiring any expensive drilling operations.

While there has been disclosed in this specification one form in which the invention may be embodied, it is to be understood that this form is shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosure but may be modified and embodied in various other forms without departing from its spirit. In short, the invention includes all the modifications and embodiments coming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new, and for which it is desired to secure Letters Patent, is:

1. In a machine for producing a tubular headed rivet, a reciprocating gate member carrying an extruding punch and a heading punch, a stationary die bed having a recess for holding a blank while the shank is being extruded around said extruding punch, means for stripping said extruding punch from said blank leaving said blank within said recess, means for raising said punches to bring said heading punch into allnement with said blank, said die-bed having a lower heading socket, means on said heading punch for receiving said tubular blank from said recess. and serving to hold said blank while the punches are lowered to bring it down into alinement with said heading socket, and means to eject said finished rivet from said heading punch.

2. In a two-blow machine for producing a tubular headed rivet, a pair of cooperating punch and die holders, said punch holder carrying an upper extruding punch for forming a tubular shank on a rivet blank and a lower punch for heading the other end of said rivet blank, said die holder carrying an upper die for holding said blank during the formation of said tubular shank and a lower die having a socket for cooperating with said lower punch to produce a head upon said tubular rivet, means in said lower punch for holding said blank, and means for vertically reciprocating said punch holder to carry said blank from the upper to the lower operating position.

3. In afftwo-blow machine for producing a tubular headed rivet, a pair of cooperating punch and die holders, said punch holder carrying an upper extruding punch for forming a tubular shank on a rivet blank and a lower punch for heading the other end of said rivet blank, said die holder carrying an upper die for holding said blank during the formation of said tubular shank and a lower die having a socket for cooperating with said lower punch to produce a head upon said tubular rivet, means for moving said punch holder upwardly after the shank of the rivet has beenpierced, means in said upper die for transferring said blank to said lower punch, and means for moving said punch holder downwardly to bring the blank into heading position.

4. In a two-blow ing a tubular headed rivet, a horizontally and vertically movable punch holder carrying an upper extruding punch and a lower heading punch, a stationary die holder carrying an upper extruding die for cooperating with said upper punch and a lower d1e having a heading socket to cooperate with said heading punch, means in said lower punch for holding said extruded blank, and

means for raising and lowering said heading punch for transferring a rivet blank from the upper to the lower operating position;

5. In a two-blow machine for producing a tubular headed rivet, a horizontall and vertically movable punch holder carrylng an upper extruding punch and a lower heading punch, a stationary die holder carrying an upper extruding die for cooperating wlth said upper punch, and a lower die havlng a heading socket to cooperate with said heading punch, said lower heading punch having an interior stripper tube to eject the finished rivet therefrom, said stripper tube havingea pair of annular flanges, and means located tween said flanges to operate said tube.

6. In a two-blow machine for producing a tubular headed rivet, a horizontally and vertically movable punch holder carrying an upper etxruding punch and a lower heading punch, a stationar die holder carrying an upper extruding ie for cooperating with machine for produc rivet therefrom, said stripper tube having a pair of annular flanges, and a lever responsive to the movement of said punch holder havin a projecting member located between said anges to operate said tube.

7. In a two-blow machine for producing a tubular, headed rivet, a pair of cooperating punch and die holders, said punch holder carrying an upper extruding punch for forming a tubular shank on a rivet blank and a lower punch for heading the other end of said rivet blank, said die holder carrying an upper die for holdin said blank during the formation of said tu ular shank and a lower heading die for cooperating with said heading punch, means on said heading punch for receiving said blank from said upper die and serving to hold said blank while the punches are lowered to bring it down into alinement wit socket for cooperating with said lower punch to produce a head upon said tubular rivet.

8. In a two-blow machine for producing, a tubular headed rivet, a pair of cooperating punch and die holders, said punch holder carrying an upper extruding punch for forming a tubular shank on a rivet blank and a lower punch for heading the other end of said rivet blank, said die holder carrying an upper die for holding said blank during the formation of said tubular shank and a lower heading die for cooperating with said heading punch, means on said heading punch for receiving said blank from said upper die and serving to hold said blank while the punches are lowered to bring it down into alinement with said heading die, and said latter die having a spherical socket for cooperating with said lower punch to produce a head upon said tubular rivet.

9. In a two-blow machine for producing a tubular headed rivet, a pair of cooperating punch and die holders, said punch holder carrying an upper extruding punch for forming a tubular shank on a rivet blank and a lower punch for heading the other end of said rivet blank, said die holder carrying an upper die for holding said blank during the formation of said tubular shank and a lower heading die for cooperating with said heading punch, means on said heading punch for receiving said blank from said upper die and serving to hold said blank while the punches are lowered to bring it down into alinement with said heading die, said latter die having a socket for cooperating with said lower punch to produce a head upon said tubular rivet, and means for ejecting said blank from said upper die after the shank has been pierced.

10. In a two-blow machine for producing a tubular headed rivet, a pair of cooperating punch and die holders, said punch holder carrying an u per extruding punch for forming a tubular s ank on a rivet blank and a lower punch for heading the other end of said rivet blank, said die holder carrying an upper die for holding said blank during the formation of said tubular shank and a lower heading die for cooperating with said heading punch, means on said heading punch for receiving said blank from said upper die and serving to hold said blank while the punches are lowered to bring it down into alinement with said heading die, said latter die having a socket for cooperating with said lower punch to produce a head upon said tubular rivet, and means for stripping said blank from said upper punch after said shank has been pierced.

11. In a two-blow machine for producing atubularheaded rivet, a horizontally and vertically movable punch holder carrying an upper extruding punch and a lower heading h, punch, and a stationary die holder carrying said heading die, and sald latter die having a an upper extruding die for cooperating with said upper punch, a lower die having a heading socket to cooperate with said heading punch, and means on said heading punch for receiving saidblank from said upper die and serving to hold said blank while the punches are lowered to bring it down into-alinement with said heading die.

12. In a two-blow machine for producing a tubular headed rivet, a horizontally and vertical'y movable punch holder carrying an upper extruding punch and a lower heading punch, a stationary die holder carrying an upper extruding die for cooperating with said upper punch, a lower die having a heading socket to cooperate with said heading punch, said upper extruding punch having an interior adjustable rod for forming the socket in the extruded blank, and means on said heading punch for receiving said blank from said upper die and serving to hold said blank while the punches are lowered to bring it down into alinement with said heading die.

13. In a two-blow machine for producing a tubular headed rivet, a horizontally and vertically movable punch holder carrylng an upper extruding punch and a lower reading punch, and a stationary die holder carrying an upper extruding die for cooperating with said upper punch, a lower die having a heading socketto cooperate with said heading punch, said upper extruding punch and said upper extending die both having spring cushions, and means on said heading punch for receiving said blank from said upper die and serving to hold said blank while the punches are lowered to bring it down into alinement with said heading die. I

14. In a two-blow machine for producin a tubular headed rivet, a horizontally and vertically movable punch holder carrying an upper extruding punch and a lower heading punch, and a stationary die holder carrying an upper extruding die for cooperating with said upper punch, a lower die having a heading socket to cooperate with said heading punch. said lower heading punch having an.

interior stripper tube to eject the finished rivet therefrom, and means on said heading punch for receiving said blank from said upper die and serving'to hold said blank while the punches are lowered to bring it down into alinement with said heading die.

In testimony whereof, I have afiixed my signature to this specification.

CHARLES E. LYMAN. 

